You can say: Le vendredi costumé or Vendredi le jour du costume, wich is a more word to word translation . I would choose the first one.
this Friday is : 'ce vendredi' in French.
You spell it the same, 'un costume' (masc.)
Vendredi 13 is the French spelling for Friday the 13th. 13 is 'treize' in French.
Vendredi
un costume d'éléphant
le vendredi
A Chanel suit is "un tailleur Chanel" in French.
c'est vendredi.
To say "Happy Friday" in French, you can say "Joyeux vendredi." Another common expression is "Bon vendredi." Both phrases convey a cheerful greeting for the end of the week.
heureux, c'est vendredi !
vendredi, sept mars
lundi à vendredi